On December 1, 2024, various companies engaged in the following transactions:

1. Alpha Corporation purchased $18,000 of inventory on credit from Beta Suppliers.
2. Beta Suppliers granted a $2,000 discount to Alpha Corporation for early payment of the invoice from Transaction 1.
3. Gamma Enterprises paid $12,000 in cash for marketing services provided by Delta Marketing.
4. Delta Marketing provided $6,500 worth of advertising services to Epsilon Solutions on credit.
5. Epsilon Solutions returned $3,500 worth of unused marketing materials to Delta Marketing.
6. Zeta Industries sold equipment for $25,000 cash to Theta Corporation.
7. Theta Corporation paid $4,000 for consulting services provided by Iota Consulting.
8. Iota Consulting granted a $700 discount to Theta Corporation for prompt payment of the consulting invoice.
9. Kappa Ventures received a $10,000 loan from Lambda Bank.
10. Lambda Bank charged $900 as interest on the loan provided to Kappa Ventures.

Please journalize these transactions for the respective companies involved.